Automatic brake for trailers



Nv 2o, 192s. 1,692,141

l J. scHLAG'ENHAuF AUTOMATIC BRAKE FOR TRAILERS Filed pct. 19, 192e-- 2 sheets-'sheet Patented Nov. 20, 19.28.

JOHANN SCHLAGENHAUF, F OERLIKON, SWITZERLAND.

AUTOMIATIC BRAKE" TRAILERS.

Application med 'october 19, 192s, seriar No. 142,633, and in Gerr'nany January s, 19,26.

In automatic brakes for the trailersof motor lorries, in which a piston rodv guided 1n the radius bar is shifted in its longitudinal direction by the pressure exerted by the two carsl the one onto the other and pulls the brake by this movement, results the inconvenience that these piston rods may b'e bent durincr service, thisoccurring for instance if the rardius bar is dropped or if/on a bad road the front wheels of the trailer sink into the road. When the piston rod has been bent the bra-ke mechanism fails as the piston rod is no longer shiftable in longitudinal direction.

These inconveniences are avoided by the invention which will be hereinafter described.

An embodiment of the invention is shown,

by way of example, in the accompanying.

f Fig. 1.

Fig. 5 illustrates the connection of the brake rope with shaft 5 viewed from the di rection IV-IV.

The improvement consists infthat on the bogie 4 of the cara shaft 5 is mounted on which the forks 6 and 7 are keyed. To these forks 6 and 7 the ends 8 and 9 of the radius bars 1, 2 are hingedly connected. On the shaft 5 a dashpot 10 is further arranged which may consist, for instance of an lhydraulic brake.

The brake 10 consists for instance of an oil vessel 15, a stationary flap 18 and a movable fla-p 19 'fixed on shaft 5. In the hydraulic brake 10 a check valve 16 is arranged. OW.

ing to this check valve the spareI oil from III-III of4 advantageous if the space in the hydraulicbrake is permanently filledcompletely with oil, this being ensured by the valve 16 and the reservoir chamber 15. A screw 17 serves to regulate the hydraulic brake, i. e. if in the i cold season the oil in the brake becomes viscous the free cross section of the passage can f be enlarged by adjusting the screw accordingly. If the leye 3 is hooked over the coupling hook of the-tractor and if the trailer closes up on the tractor the shaft 5 is rotated in the direction of the arrow in Fig. 2 (position of the elements shown in dash and dot lines) and it pulls the brake lever system 11, 12, 13, 14 through the intermediary of thebrake 10. The lever 11 is mounted on the shaft 5. The two-armed lever 13 is hinged to lever 11 by means of a connecting ,rod 12. The lever 13 is pivotably mounted by a pin 22 in a holder 23 which is fixed to car 4. If lever 11 is moved in the direction of the arrow ,the rope 14 is pulled and the car is braked.

This influence upon the brake system ref mains effective if the radius bars 1 and 2 are bent.

I claim n A brakeacting when the trailer is closing up on the tractor, comprising in combination with the radius bar and with the bogie, of the vtrailer a. shaft rotatably mounted on said bogie two lever arms hingedl connecting the ends of said radius bar to said sha-ft, a dashpot on said shaft, and a brake lever system connected to and operated from said dashpot. In testimony whereof I aliix my signature.

JOHANN SCHLAGENI-IAUF. 

